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Spontaneous combustion in six types of coal by using the simultaneous thermal analysis-Fourier transform infrared spectroscopy technique

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Abstract

Using simultaneous thermal analysis-Fourier transform infrared spectroscopy, we analyzed the oxidation and exothermic behaviors of six types of coal based on various factors, such as characteristic temperature, heat release, and gas release, to establish a foundation for prevention and control of spontaneous combustion in six types of coal in China. According to the experimental results, a decrease in the metamorphic grade of coal causes an increase in the amount of volatile matter, the heat release rate, and the total heat released. The apparent exothermic onset temperature and initial temperature for the release of H2O, CO2, CO, and CH4 during the nonisothermal oxidation process of coal took place earlier, indicating that the oxidation reaction occurred more easily in lower-grade coal, increasing the hazards of spontaneous combustion. Moreover, when decomposing, coal releases large amounts of CH4, which may cause gas explosions in coal mines. Therefore, technology facilitating the detection of CH4 and prevention of explosions should be developed for use in the coal industry.

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Abbreviations

A ad :

Ash content (%)

FCad :

Fixed carbon content (%)

M ad :

Moisture content (%)

T 1 :

Characteristic temperature of maximum evaporation of water and desorption of gases (°C)

T 2 :

Characteristic temperature of maximum oxidization mass gain (°C)

T 3 :

Characteristic temperature of ignition point (°C)

T 4 :

Characteristic temperature of maximum mass loss rate (°C)

T 5 :

Characteristic temperature of terminal residual (°C)

T D1 :

Temperature at the maximum endothermic reaction with evaporation of water and desorption of gases (°C)

T D2 :

Exothermic onset temperature of oxidation reaction (°C)

T D3 :

Temperature at the maximum heat release rate (°C)

T D4 :

Temperature at the end of the combustion reaction (°C)

V ad :

Volatile contents (%)

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Acknowledgements

Financial support for this work was provided by two key projects of the National Natural Science Foundation of China (Nos. 51134019 and 5150418), and the Natural Science Foundation of Shaanxi Province (CN) (No. 2014JM7276) is also gratefully acknowledged.

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Authors and Affiliations

  1. College of Safety Engineering, Key Laboratory of Western Mine Exploitation and Hazard Prevention of Ministry of Education, Xi’an University of Science and Technology (XUST), 58, Yanta Mid. Rd., Yanta Zone, Xi’an, 710054, Shaanxi, China

    Caiping Wang, Yi Yang & Jun Deng

  2. Center for Process Safety and Industrial Disaster Prevention, School of Engineering, National Yunlin University of Science and Technology (Yuntech), 123, University Rd., Sec. 3, Douliou, 64002, Yunlin, Taiwan, ROC

    Yun-Ting Tsai & Chi-Min Shu

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  1. Caiping Wang
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  2. Yi Yang
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  3. Yun-Ting Tsai
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  4. Jun Deng
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  5. Chi-Min Shu
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Correspondence to Chi-Min Shu.

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Wang, C., Yang, Y., Tsai, YT. et al. Spontaneous combustion in six types of coal by using the simultaneous thermal analysis-Fourier transform infrared spectroscopy technique. J Therm Anal Calorim 126, 1591–1602 (2016). https://doi.org/10.1007/s10973-016-5685-2

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  • DOI: https://doi.org/10.1007/s10973-016-5685-2

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